Dolly bar



Dec. 30, 1924.`

H. A. LACERDA DoLLY BAR Filed Sept. 14, 1923 2 Sheets-Sheet 1 WIM/8858 lm MM5( Dec. 30. 1924. 1,521,547

H. A. LACERDA DoLLY BAR Filed Sept. 14, 1923 2 Sheets-Sheet, 2

Z5 JZ* 30g/.552.926

Patented Dec. 30, 1924.

NTE` STT LEZLM? @rtrlity DOLIY BAR.

Application filed September To all whom t mog] concer/n.:

Be it known that l, HARRY A. LiionnDA,

a citizen oi"- the United States, and a resident of l/Vatervliet, in the county ot Albany 5 and State ot New York, have invented a new and Improved Dolly Bar, ot which the following is a full7 clear, and exact description.

rilhis invention relates to improvements in tools, and has particular reference to a dolly bar employed in mountino' llexible stay bolts.

lin the construction and repair of tire boxes `for locomotive engines and the like$ it is essential when securing a stay bolt in position that care be taken to prevent Hattening or deformation ot the head ot the bolt which would otherwise disrupt or injure the bushing in which said head is mounted and thus aii'ect the proper eXpansion and contraction ot the lire box walls.

Two methods have heretofore been employed in the mounting of flexible stay bolts. First, it has been a common practice to shear off the closed end oil a nut or cap which is ordinarily threaded on the bushing after a stay bolt has been secured in position. rlhe sheared nut-is iirst threaded on the bushing, after which a sledge is engaged with the fiat surface ot a nut formedr by the sheared end, and held in engagement therewith while the automatic hammer is being used to head the other end of the bolt. lt then becomes necessary to remove the sheared nut and replace the same with another of ythe same type which has not been sheared. Th'esecond method is similar to the one just mentioned in that a tool is utilized including a bodyportion which must be'V threaded upon the bushing during the process of securing the stay bolt in place, after which said body portion must be removed from the bushing and a vnut like the one last mention threaded thereon. lt has. been found in practicing these methods that considerable time and labor is expended in mounting in place and removing the sheared nut ot' the first method and the tool of the second method. Furthermore, it has been found that in employing said methods extreme care must be exercised when utilizing old bushings in new mcuntings as is often done, due to the fact that said bushings become very brittle and theretoreveasily split or otherwise damaged.

An object of the present invention is to i4, 192s. semi no, 662x223.

provide an improved tool of exceedingly simple and eiiicient construction, the use oit which will overcome the objections to the above methods by making it unnecessary to thread any element on to the bushing prior to securing the bolt in place and removing` said element subsequent to the securing op eration.

The above and other objects will appear more clearly from the following detail description, when talen in connection with the accompanying drawings7 which illustrate preferred embodiments ot the inventive idea.

ln the drawingsf .Figure l is a sectional view illustrating the iirst ot the above mentioned known methods ot securing a stay bolt in position;

Figure 2 is a similar view illustrating the second mentioned method;

Figur 3 is an elevation oi a nut or cap which is used in connection with said methods;

Fgure l is a view similar to Figures l and 2 showing the method oitremploving the tool of the present invention; i

Figure is a side elevation or' one form of tool embodying features of the present invention; i

Figure 6 is a longitudinal section on the line 6 6 or Figure Figure is a section on the line ot Figure 6;

Figure 8 is a longitudinal section through a different forni of the invention;

Figure 9 is a fragmentary elevation ot' the form shown in Figure 8; and

Figure l is a section'on the line lO-l() ,of Figure 8. l

Referring more j nirticularlyto the accompanying drawings, the numeral l1 indicates the inner wall or rire box sheet of a locomotive fire box, which is surrounded in spaced relation by the outer wall or outside wrapper sheet l2. The sheets il and 'l2 are `provided with aligned openings i3 and lll, respectivelyythe latter openings being screw threaded and oi' large-r diainei'ier to receive the usual bushings l utilized to provide a mounting 'for the headed end oi the flexible stay bolts lo, the heads ot which are rounded so as to provide a inountingtor the stay bolts in the bushings in the nature ot a swivel connection which will permit ot the usual relative expansion between the sheets ll and l2, ln accordance with the first of the above lll) mentioned methods, i after a bushing 15 has been mounted in place with "the -outeriend thereof projecting beyond the outer surface oi' the sheet 12 and a staybolt 16 has been' mounted in the positionshovv'n, a'nut or cap 17 which has had its closed end sheared oil',

as indicated in dotted lines in Figure 3, to

provide a flat outer surface isthreaded'upon the outer end of the 'bushing 15 in Whi ch the s headfofthe staybolt isdisposed. Ai-Sledge 18 is fAthen engaged with the yflat outersurface of the nuts117 after which-the automatic hammer, conventionally Yilliistrat-ed l"by the numeral 19, is 'engaged With ithejinner lend 3e of 'l'the "stay bolt and loperated Ato form-the inw thevstay bolts and thereafter remove fthe 'ation 'df securn sheared nuts andlreplace thefsame Withn'uts which are unsheared. i Y

In accordance'ivith the second mentioned method, as illustrated lin Figure 2, ais'lieared iiiit`=i`s-frepl-aced VE-by la 'to'o'l including` a body 'portion 21 internally threaded at one -lendfor receiving the Vextended fen'do-'a bushing R15 having mova'ble longitudinally thereof a pi *22 the inner 'end of 'which jconcaved to engage the head of thestay bolt. llhefoi'iter end of l'the lpin 22 projects beyond the body yportion 2-1 andmay beengagedbythe Sledge 18 to hold l'the pin'22lagai`nst` the :stay V-bolt as the opposite end is being headed 'by the 'aiitmati'c hammer. In lthis method #it fvill be seen that iit 'is necessary, as in ith-e ifirst method, to attach, by th're'adi'n'g, an element to the bushing 15 prior to thegao'tu'al operthe bolt Iin place. UvAlfter the latter operation the toolv21fmustbe removed so that the nut 17 ym-ayfbe lmounted upon the bushing. Y

The pi'esent'invention 1s designed ftjor 'fthe purpose -of providing a tool -which, by its luse, will dispense with the `'necessity of mounting an element uponthelbu'shinggprior 'to the use 'oi'.the 'automatic lhammer,"this 'eliminating 'the lloss of Vtime and -erpens'e lin- V-`solved in theusual methods. Tothis-endthe "tool comprises, as'shown in the formA illustrated in Figures 5,56 and 7, abodyrportion 23 which maybe made'of an'ydesira'ble material, such as machine steel, vhaving affreutilized to acilitate the 'handling foi the tool when in use. The body portion "-23 ifs pro- 'vided A'therein with a chamber'25 extending longitudinally thereof for a considerablf-iYl portion oits length and communicating at n its op'enend WithLthe-endfiofthebody portion Yopposite the handle 24. The open endv of the body portion 23 is reducedand eX- ternally screw Vthreaded to receive thereon a cap 26 having a centrally disposed openc ing -27 therein communicating V'with the rchamber 25. Slidably mounted in the cham- Y ber and having an end projecting. through the opening 27- is a head 28 providedat its inner end with a flange-29 `ofgrea-ter diameterthanthe opening 2,7 and-offsubstantially thefsame diameter asthat-.offthe ohamber25,

Vso kthatoutward,movement of thehead ivill be flimited "by contact yof the -lange L29 Y with the fc'apr26. Also mounted -forilongitudinal movement in the chamber 25 inwardly ofthe head 28 `is acentering pinfl() having a `flange orahead31'engageable with the flange 29.

able vvitli-theinner endoi' said chamberiand the other end en'gagedavith the 'Yiiangev 31.

The spring 32 also provides c a shock absorb;V

'ing cushion `for the head 28 as the. samefis forced inwardly gby the actionofthe automaticfhammer against the sta-y bolt 16. Also the reaction 'oi' the spring' -isfsuch that the head ofthe stay bolt will beunafected--and will readily enable the user to `vhold the tool fin proper position.. c The bodyV :perdoni-23 is further provided with Van opening 33 ythrough lwhich ya lubricant may be injected Ainto 4the Fcham'berQ to present binding of either o fthe Vflanges 29 or f 31;'in said cha-mfbe'r as the :same are rapidly reciprocated The fouter extremity of the Vhead A28 ,is 4con- {caveth i as findicated l at 34, -and shaped lto Iconllformto. the contour of the V-headed end of the 4stay fboltsvso that the tool may `be YAheld lin proper operative position during the operation o'fthe automaticrihammer.

'Inriatheform lolii-the invention shown-in Figures 8, 49 and10,--the body portion 35 :of

i:the 'tool is provided Withaehamber I36, similar (toi-the chamber 25, and is furthenprdY 'vided adjacent its freefend with oppositely 1"disposed .longitudinally --extending slots-37- sliding fliead 38 isV 0'1"'- substantially the same construction Vas the i head 28 'except thaty the Tinne-r end lthereof` iis not proi'fided vv-ith"aY lfl'anige, the lflange in the present --instance being located adjacent the Iouterend ofthe head and indicated by `thenumeral 39. The" position 'of the `flange 39 Will thuslimit the inward movement of the `headas the same is reciproca-ted., LExtending transversely f through an intermediate V=porti`on1offthe head which extend through the Vo ppositely dis- Y Yv -communicating 'with"thechamberBd TheV 38 lis a pin orb'olt 40, ithe extremities of Y Lposed slots 37 the `--vvalls of Vwhich act asV Y catory movement of the head. A centering pin 41, similar in construction to the pin 30, is also mounted within the chamber 36 inwardly of the head 38 and forms an abutment for one end of a coil spring 42, similar to the spring 32.

From the foregoing description, it will be apparent that the invention provides a tool which will effectively hold a stay bolt in position while the same is being` secured in place without employing` a means necessary to be attached to and detached from the bushing What is claimed is:

l. In a dolly bar, a body portion having a longitudinal chamber therein extending to one end thereof, a reciprocatory head mounted within said chamber and having one end projecting therefrom and capable of engaging the head ot a stay bolt, a headed centering pin engageable with the inner end of said head, and a coil spring having a portion embracing said centering pin and interposed between the head of said pin and the inner end of said chamber.

2. In a dolly bar, a body portion having a longitudinal chamber therein extending to one end thereof, a removable cap for said end of the body portion having an opening therein of less diameter than that of said chamber, a reciprocatory head slidably mounted in the opening in said cap and in said chamber and having a reduced portion projecting beyond said cap for engagement with the head or' a stay bolt, the inner end of said head being pyovided with a flange engageable with the cap to prevent detachment of the head from said body portion, a centering pin having a flange abutting the ange of said head, and resilient means interposed between the inner end of said chamber and the ange of said centering pin for Caxerting an outward pressure upon said hea HARRY A. LACERDA. 

